<template>
    <Teleport :to="appendTarget" :disabled="appendDisabled">
        <div :ref="maskRef" :class="maskClass" v-if="containerVisible" @click="onMaskClick">
            <transition name="p-dialog" @before-enter="onBeforeEnter" @enter="onEnter" @before-leave="onBeforeLeave" @leave="onLeave" @after-leave="onAfterLeave" appear>
                <div :ref="containerRef" :class="dialogClass" v-if="visible" v-bind="$attrs" role="dialog" :aria-labelledby="ariaLabelledById" :aria-modal="modal">
                    <div class="p-dialog-header" v-if="showHeader" @mousedown="initDrag">
                        <slot name="header">
                            <span :id="ariaLabelledById" class="p-dialog-title" v-if="header">{{header}}</span>
                        </slot>
                        <div class="p-dialog-header-icons">
                            <button class="p-dialog-header-icon p-dialog-header-maximize p-link" @click="maximize" v-if="maximizable" type="button" tabindex="-1" v-ripple>
                                <span :class="maximizeIconClass"></span>
                            </button>
                            <button class="p-dialog-header-icon p-dialog-header-close p-link" @click="close" v-if="closable" :aria-label="ariaCloseLabel" type="button" v-ripple>
                                <span class="p-dialog-header-close-icon pi pi-times"></span>
                            </button>
                        </div>
                    </div>
                    <div :class="contentStyleClass" :style="contentStyle">
                        <slot></slot>
                    </div>
                    <div class="p-dialog-footer" v-if="footer || $slots.footer">
                        <slot name="footer">{{footer}}</slot>
                    </div>
                </div>
            </transition>
        </div>
    </Teleport>
</template>

<script>
import {UniqueComponentId,DomHandler,ZIndexUtils} from 'primevue/utils';
import Ripple from 'primevue/ripple';

export default {
    name: 'Dialog',
    inheritAttrs: false,
    emits: ['update:visible','show','hide','maximize','unmaximize','dragend'],
    props: {
        header: null,
        footer: null,
        visible: Boolean,
        modal: Boolean,
        contentStyle: null,
        contentClass: String,
        rtl: Boolean,
        maximizable: Boolean,
        dismissableMask: Boolean,
        closable: {
            type: Boolean,
            default: true
        },
        closeOnEscape: {
            type: Boolean,
            default: true
        },
        showHeader: {
            type: Boolean,
            default: true
        },
        baseZIndex: {
            type: Number,
            default: 0
        },
        autoZIndex: {
            type: Boolean,
            default: true
        },
        ariaCloseLabel: {
            type: String,
            default: 'close'
        },
        position: {
            type: String,
            default: 'center'
        },
        breakpoints: {
            type: Object,
            default: null
        },
        draggable: {
            type: Boolean,
            default: true
        },
        keepInViewport: {
            type: Boolean,
            default: true
        },
        minX: {
            type: Number,
            default: 0
        },
        minY: {
            type: Number,
            default: 0
        },
        appendTo: {
            type: String,
            default: 'body'
        }
    },
    data() {
        return {
            containerVisible: this.visible,
            maximized: false
        }
    },
    documentKeydownListener: null,
    container: null,
    mask: null,
    styleElement: null,
    dragging: null,
    documentDragListener: null,
    documentDragEndListener: null,
    lastPageX: null,
    lastPageY: null,
    updated() {
        if (this.visible) {
            this.containerVisible = this.visible;
        }
    },
    beforeUnmount() {
        this.unbindDocumentState();
        this.unbindGlobalListeners();
        this.destroyStyle();

        this.mask = null;

        if (this.container && this.autoZIndex) {
            ZIndexUtils.clear(this.container);
        }
        this.container = null;
    },
    mounted() {
        if (this.breakpoints) {
            this.createStyle();
        }
    },
    methods: {
        close() {
            this.$emit('update:visible', false);
        },
        onBeforeEnter(el) {
            if (this.autoZIndex) {
                ZIndexUtils.set('modal', el, this.baseZIndex + this.$primevue.config.zIndex.modal);
            }

            el.setAttribute(this.attributeSelector, '');
        },
        onEnter() {
            this.mask.style.zIndex = String(parseInt(this.container.style.zIndex, 10) - 1);

            this.$emit('show');
            this.focus();
            this.enableDocumentSettings();
            this.bindGlobalListeners();
        },
        onBeforeLeave() {
            if (this.modal) {
                DomHandler.addClass(this.mask, 'p-component-overlay-leave');
            }
        },
        onLeave() {

            this.$emit('hide');
        },
        onAfterLeave(el) {
            if (this.autoZIndex) {
                ZIndexUtils.clear(el);
            }
            this.containerVisible = false;
            this.unbindDocumentState();
            this.unbindGlobalListeners();
        },
        onMaskClick(event) {
            if (this.dismissableMask && this.closable && this.modal && this.mask === event.target) {
                this.close();
            }
        },
        focus() {
            let focusTarget = this.container.querySelector('[autofocus]');
            if (focusTarget) {
                focusTarget.focus();
            }
        },
        maximize(event) {
            if (this.maximized) {
                this.maximized = false;
                this.$emit('unmaximize', event);
            }
            else {
                this.maximized = true;
                this.$emit('maximize', event);
            }

            if (!this.modal) {
                if (this.maximized)
                    DomHandler.addClass(document.body, 'p-overflow-hidden');
                else
                    DomHandler.removeClass(document.body, 'p-overflow-hidden');
            }
        },
        enableDocumentSettings() {
            if (this.modal || (this.maximizable && this.maximized)) {
                DomHandler.addClass(document.body, 'p-overflow-hidden');
            }
        },
        unbindDocumentState() {
            if (this.modal || (this.maximizable && this.maximized)) {
                DomHandler.removeClass(document.body, 'p-overflow-hidden');
            }
        },
        onKeyDown(event) {
            if (event.which === 9) {
                event.preventDefault();
                let focusableElements = DomHandler.getFocusableElements(this.container);
                if (focusableElements && focusableElements.length > 0) {
                    if (!document.activeElement) {
                        focusableElements[0].focus();
                    }
                    else {
                        let focusedIndex = focusableElements.indexOf(document.activeElement);
                        if (event.shiftKey) {
                            if (focusedIndex == -1 || focusedIndex === 0)
                                focusableElements[focusableElements.length - 1].focus();
                            else
                                focusableElements[focusedIndex - 1].focus();
                        }
                        else {
                            if (focusedIndex == -1 || focusedIndex === (focusableElements.length - 1))
                                focusableElements[0].focus();
                            else
                                focusableElements[focusedIndex + 1].focus();
                        }
                    }
                }
            } else if (event.which === 27 && this.closeOnEscape) {
                this.close();
            }
        },
        bindDocumentKeyDownListener() {
            if (!this.documentKeydownListener) {
                this.documentKeydownListener = this.onKeyDown.bind(this);
                window.document.addEventListener('keydown', this.documentKeydownListener);
            }
        },
        unbindDocumentKeyDownListener() {
            if (this.documentKeydownListener) {
                window.document.removeEventListener('keydown', this.documentKeydownListener);
                this.documentKeydownListener = null;
            }
        },
        getPositionClass() {
            const positions = ['left', 'right', 'top', 'topleft', 'topright', 'bottom', 'bottomleft', 'bottomright'];
            const pos = positions.find(item => item === this.position);

            return pos ? `p-dialog-${pos}` : '';
        },
        containerRef(el) {
            this.container = el;
        },
        maskRef(el) {
            this.mask = el;
        },
        createStyle() {
			if (!this.styleElement) {
				this.styleElement = document.createElement('style');
				this.styleElement.type = 'text/css';
				document.head.appendChild(this.styleElement);

                let innerHTML = '';
                for (let breakpoint in this.breakpoints) {
                    innerHTML += `
                        @media screen and (max-width: ${breakpoint}) {
                            .p-dialog[${this.attributeSelector}] {
                                width: ${this.breakpoints[breakpoint]} !important;
                            }
                        }
                    `
                }

                this.styleElement.innerHTML = innerHTML;
			}
		},
        destroyStyle() {
            if (this.styleElement) {
                document.head.removeChild(this.styleElement);
                this.styleElement = null;
            }
        },
        initDrag(event) {
            if (DomHandler.hasClass(event.target, 'p-dialog-header-icon') || DomHandler.hasClass(event.target.parentElement, 'p-dialog-header-icon')) {
                return;
            }

            if (this.draggable) {
                this.dragging = true;
                this.lastPageX = event.pageX;
                this.lastPageY = event.pageY;

                this.container.style.margin = '0';
                DomHandler.addClass(document.body, 'p-unselectable-text');
            }
        },
        bindGlobalListeners() {
            if (this.draggable) {
                this.bindDocumentDragListener();
                this.bindDocumentDragEndListener();
            }

            if (this.closeOnEscape && this.closable) {
                this.bindDocumentKeyDownListener();
            }
        },
        unbindGlobalListeners() {
            this.unbindDocumentDragListener();
            this.unbindDocumentDragEndListener();
            this.unbindDocumentKeyDownListener();
        },
        bindDocumentDragListener() {
            this.documentDragListener = (event) => {
                if (this.dragging) {
                    let width = DomHandler.getOuterWidth(this.container);
                    let height = DomHandler.getOuterHeight(this.container);
                    let deltaX = event.pageX - this.lastPageX;
                    let deltaY = event.pageY - this.lastPageY;
                    let offset = this.container.getBoundingClientRect();
                    let leftPos = offset.left + deltaX;
                    let topPos = offset.top + deltaY;
                    let viewport = DomHandler.getViewport();

                    this.container.style.position = 'fixed';

                    if (this.keepInViewport) {
                        if (leftPos >= this.minX && (leftPos + width) < viewport.width) {
                            this.lastPageX = event.pageX;
                            this.container.style.left = leftPos + 'px';
                        }

                        if (topPos >= this.minY && (topPos + height) < viewport.height) {
                            this.lastPageY = event.pageY;
                            this.container.style.top = topPos + 'px';
                        }
                    }
                    else {
                        this.lastPageX = event.pageX;
                        this.container.style.left = leftPos + 'px';
                        this.lastPageY = event.pageY;
                        this.container.style.top = topPos + 'px';
                    }
                }
            }
            window.document.addEventListener('mousemove', this.documentDragListener);
        },
        unbindDocumentDragListener() {
            if (this.documentDragListener) {
                window.document.removeEventListener('mousemove', this.documentDragListener);
                this.documentDragListener = null;
            }
        },
        bindDocumentDragEndListener() {
            this.documentDragEndListener = (event) => {
                if (this.dragging) {
                    this.dragging = false;
                    DomHandler.removeClass(document.body, 'p-unselectable-text');

                    this.$emit('dragend', event);
                }
            };
            window.document.addEventListener('mouseup', this.documentDragEndListener);
        },
        unbindDocumentDragEndListener() {
            if (this.documentDragEndListener) {
                window.document.removeEventListener('mouseup', this.documentDragEndListener);
                this.documentDragEndListener = null;
            }
        }
    },
    computed: {
        maskClass() {
            return ['p-dialog-mask', {'p-component-overlay p-component-overlay-enter': this.modal}, this.getPositionClass()];
        },
        dialogClass() {
            return ['p-dialog p-component', {
                'p-dialog-rtl': this.rtl,
                'p-dialog-maximized': this.maximizable && this.maximized,
                'p-input-filled': this.$primevue.config.inputStyle === 'filled',
                'p-ripple-disabled': this.$primevue.config.ripple === false
            }];
        },
        maximizeIconClass() {
            return ['p-dialog-header-maximize-icon pi', {
                'pi-window-maximize': !this.maximized,
                'pi-window-minimize': this.maximized
            }];
        },
        ariaId() {
            return UniqueComponentId();
        },
        ariaLabelledById() {
            return this.header != null ? this.ariaId + '_header' : null;
        },
        attributeSelector() {
            return UniqueComponentId();
        },
        contentStyleClass() {
            return ['p-dialog-content', this.contentClass];
        },
        appendDisabled() {
            return this.appendTo === 'self';
        },
        appendTarget() {
            return this.appendDisabled ? null : this.appendTo;
        }
    },
    directives: {
        'ripple': Ripple
    }
}
</script>
<style>
.p-dialog-mask {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    pointer-events: none;
}

.p-dialog-mask.p-component-overlay {
    pointer-events: auto;
}

.p-dialog {
    display: flex;
    flex-direction: column;
    pointer-events: auto;
    max-height: 90%;
    transform: scale(1);
}

.p-dialog-content {
    overflow-y: auto;
}

.p-dialog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.p-dialog-footer {
    flex-shrink: 0;
}

.p-dialog .p-dialog-header-icons {
    display: flex;
    align-items: center;
}

.p-dialog .p-dialog-header-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

/* Fluid */
.p-fluid .p-dialog-footer .p-button {
    width: auto;
}

/* Animation */
/* Center */
.p-dialog-enter-active {
    transition: all 150ms cubic-bezier(0, 0, 0.2, 1);
}
.p-dialog-leave-active {
    transition: all 150ms cubic-bezier(0.4, 0.0, 0.2, 1);
}
.p-dialog-enter-from,
.p-dialog-leave-to {
    opacity: 0;
    transform: scale(0.7);
}

/* Top, Bottom, Left, Right, Top* and Bottom* */
.p-dialog-top .p-dialog,
.p-dialog-bottom .p-dialog,
.p-dialog-left .p-dialog,
.p-dialog-right .p-dialog,
.p-dialog-topleft .p-dialog,
.p-dialog-topright .p-dialog,
.p-dialog-bottomleft .p-dialog,
.p-dialog-bottomright .p-dialog {
    margin: .75rem;
    transform: translate3d(0px, 0px, 0px);
}
.p-dialog-top .p-dialog-enter-active,
.p-dialog-top .p-dialog-leave-active,
.p-dialog-bottom .p-dialog-enter-active,
.p-dialog-bottom .p-dialog-leave-active,
.p-dialog-left .p-dialog-enter-active,
.p-dialog-left .p-dialog-leave-active,
.p-dialog-right .p-dialog-enter-active,
.p-dialog-right .p-dialog-leave-active,
.p-dialog-topleft .p-dialog-enter-active,
.p-dialog-topleft .p-dialog-leave-active,
.p-dialog-topright .p-dialog-enter-active,
.p-dialog-topright .p-dialog-leave-active,
.p-dialog-bottomleft .p-dialog-enter-active,
.p-dialog-bottomleft .p-dialog-leave-active,
.p-dialog-bottomright .p-dialog-enter-active,
.p-dialog-bottomright .p-dialog-leave-active {
    transition: all .3s ease-out;
}
.p-dialog-top .p-dialog-enter-from,
.p-dialog-top .p-dialog-leave-to {
    transform: translate3d(0px, -100%, 0px);
}
.p-dialog-bottom .p-dialog-enter-from,
.p-dialog-bottom .p-dialog-leave-to {
    transform: translate3d(0px, 100%, 0px);
}
.p-dialog-left .p-dialog-enter-from,
.p-dialog-left .p-dialog-leave-to,
.p-dialog-topleft .p-dialog-enter-from,
.p-dialog-topleft .p-dialog-leave-to,
.p-dialog-bottomleft .p-dialog-enter-from,
.p-dialog-bottomleft .p-dialog-leave-to {
    transform: translate3d(-100%, 0px, 0px);
}
.p-dialog-right .p-dialog-enter-from,
.p-dialog-right .p-dialog-leave-to,
.p-dialog-topright .p-dialog-enter-from,
.p-dialog-topright .p-dialog-leave-to,
.p-dialog-bottomright .p-dialog-enter-from,
.p-dialog-bottomright .p-dialog-leave-to {
    transform: translate3d(100%, 0px, 0px);
}

/* Maximize */
.p-dialog-maximized {
    -webkit-transition: none;
    transition: none;
    transform: none;
    width: 100vw !important;
    height: 100vh !important;
    top: 0px !important;
    left: 0px !important;
    max-height: 100%;
    height: 100%;
}
.p-dialog-maximized .p-dialog-content {
    flex-grow: 1;
}

/* Position */
.p-dialog-left {
    justify-content: flex-start;
}
.p-dialog-right {
    justify-content: flex-end;
}
.p-dialog-top {
    align-items: flex-start;
}
.p-dialog-topleft {
    justify-content: flex-start;
    align-items: flex-start;
}
.p-dialog-topright {
    justify-content: flex-end;
    align-items: flex-start;
}
.p-dialog-bottom {
    align-items: flex-end;
}
.p-dialog-bottomleft {
    justify-content: flex-start;
    align-items: flex-end;
}
.p-dialog-bottomright {
    justify-content: flex-end;
    align-items: flex-end;
}

.p-confirm-dialog .p-dialog-content {
    display: flex;
    align-items: center;
}
</style>
